Suri CruisePlastered'No Butt Smacking'

9/4/2013 10:43 AM PDT

Suri Cruise -- PLASTERED ... 'No Butt Smacking'

EXCLUSIVE

Suri Cruise is on the mend after breaking her arm recently, rocking a badass plaster cast in NYC yesterday filled with signatures and doodles from friends -- including some mysterious words of advice ... "no butt smacking with this."

We don't know who would write "no butt smacking" on a 7-year-old's cast, OR WHY, but Suri should probably listen.

Luckily, Suri looked in good spirits despite the busted limb, holding on to her mama's hand.

Still no word on how she broke it though (too much butt smacking?). Get well soon!